针对纯电动汽车减速器噪声突出问题,对减速器啸叫产生机理进行了分析,以传递路径分析的思路对噪声进行了分析;对减速器高阶次啸叫从降低激励源方向进行了优化,对减速器低阶次啸叫通过优化路径上的共振解决;最后将优化方案进行实车验证,...针对纯电动汽车减速器噪声突出问题,对减速器啸叫产生机理进行了分析,以传递路径分析的思路对噪声进行了分析;对减速器高阶次啸叫从降低激励源方向进行了优化,对减速器低阶次啸叫通过优化路径上的共振解决;最后将优化方案进行实车验证,结果表明,车内22阶噪声在车速50-20Km/h平均降低7.2 dB (A),车内8.58阶噪声在车速80-90Km/h峰值降低5.1 dB(A),达到上市要求。展开更多
Gearbox whine noise can seriously reduce the interior sound quality in an electric passenger car.In this work,a six-degree-offreedom(6-DOF)dynamic model of a helical gear system was constructed and the mechanism for g...Gearbox whine noise can seriously reduce the interior sound quality in an electric passenger car.In this work,a six-degree-offreedom(6-DOF)dynamic model of a helical gear system was constructed and the mechanism for generation of whine noise was analyzed.The root cause of the problem was found through noise,vibration and harshness(NVH)testing of the gearbox and the vehicle.A rigid-elastic coupling dynamics model of the reducer assembly was then developed.The accuracy of the model was then validated via modal testing.The structure-borne noise of the reducer under full acceleration conditions was predicted using the acoustic structure coupling model and the rigid-elastic coupling model of the reducer.Gear parameters including the pressure angle,the helix angle and the contact ratio were studied to determine their effects on the whine noise.Gear tooth microgeometry modification parameters were then optimized to reduce the transmission error of the first pair of meshing gears.Finally,the whine noise from the gearbox was eliminated.展开更多
文摘针对纯电动汽车减速器噪声突出问题,对减速器啸叫产生机理进行了分析,以传递路径分析的思路对噪声进行了分析;对减速器高阶次啸叫从降低激励源方向进行了优化,对减速器低阶次啸叫通过优化路径上的共振解决;最后将优化方案进行实车验证,结果表明,车内22阶噪声在车速50-20Km/h平均降低7.2 dB (A),车内8.58阶噪声在车速80-90Km/h峰值降低5.1 dB(A),达到上市要求。
文摘Gearbox whine noise can seriously reduce the interior sound quality in an electric passenger car.In this work,a six-degree-offreedom(6-DOF)dynamic model of a helical gear system was constructed and the mechanism for generation of whine noise was analyzed.The root cause of the problem was found through noise,vibration and harshness(NVH)testing of the gearbox and the vehicle.A rigid-elastic coupling dynamics model of the reducer assembly was then developed.The accuracy of the model was then validated via modal testing.The structure-borne noise of the reducer under full acceleration conditions was predicted using the acoustic structure coupling model and the rigid-elastic coupling model of the reducer.Gear parameters including the pressure angle,the helix angle and the contact ratio were studied to determine their effects on the whine noise.Gear tooth microgeometry modification parameters were then optimized to reduce the transmission error of the first pair of meshing gears.Finally,the whine noise from the gearbox was eliminated.
